# Selection

## Everything Is Powered By Selection

Saved expression library items are created by your initial selection. There are two types of saved expression that are created from 3 different types of selection.

#### Type 1 Expression:

Type 1 expression relates to an expression library item that contains only a single expression with or without keyframes.

#### Type 2 Expression:

Type 2 expression relates to an expression library item that contains multiple expressions with or without keyframes.

{% hint style="info" %}
Type 2 expressions are saved inside a seperate node called multi. This is to differentiate them from others.
{% endhint %}


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